type T =
  | 'a1'
  | 'a2'
  | 'a3'
  | 'a4'
  | 'a5'
  | 'a6'
  | 'a7'
  | 'a8'
  | 'a9'
  | 'a10'
  | 'a11'
  | 'a12'
  | 'a13'
  | 'a14'
  | 'a15'
  | 'a16'
  | 'a17'
  | 'a18'
  | 'a19'
  | 'a20'
  | 'a21'
  | 'a22'
  | 'a23'
  | 'a24'
  | 'a25'
  | 'a26'
  | 'a27'
  | 'a28'
  | 'a29'
  | 'a30'
  | 'a31'
  | 'a32'
  | 'a33'
  | 'a34'
  | 'a35'
  | 'a36'
  | 'a37'
  | 'a38'
  | 'a39'
  | 'a40'
  | 'a41'
  | 'a42'
  | 'a43'
  | 'a44'
  | 'a45'
  | 'a46'
  | 'a47'
  | 'a48'
  | 'a49'
  | 'a50'
  | 'a51'
  | 'a52'
  | 'a53'
  | 'a54'
  | 'a55'
  | 'a56'
  | 'a57'
  | 'a58'
  | 'a59'
  | 'a60'
  | 'a61'
  | 'a62'
  | 'a63'
  | 'a64'
  | 'a65'
  | 'a66'
  | 'a67'
  | 'a68'
  | 'a69'
  | 'a70'
  | 'a71'
  | 'a72'
  | 'a73'
  | 'a74'
  | 'a75'
  | 'a76'
  | 'a77'
  | 'a78'
  | 'a79'
  | 'a80'
  | 'a81'
  | 'a82'
  | 'a83'
  | 'a84'
  | 'a85'
  | 'a86'
  | 'a87'
  | 'a88'
  | 'a89'
  | 'a90'
  | 'a91'
  | 'a92'
  | 'a93'
  | 'a94'
  | 'a95'
  | 'a96'
  | 'a97'
  | 'a98'
  | 'a99'
  | 'a100'
  | () => void;

declare var x: T;
var y = x;
y = "hello"; // error;
